fix(create-vite): error on invalid template in non-interactive mode

[CoderSilicon]

Description

Currently, when running create-vite in non-interactive mode (e.g., via a CI/CD script or passing --no-interactive), providing an invalid template name via the --template flag results in a silent fallback to vanilla-ts. This can mask typos or automation configuration errors, thus creating an unexpected project blueprint without warning.

This PR adds an explicit check for invalid user-supplied templates when interactive mode is disabled. If an invalid template is detected, the Output now logs an error message listing the valid template keys and exits with a status code of 1.

Related Issues

This was discovered while auditing the non-interactive workflow configuration logic in packages/create-vite/src/index.ts.

Alternatives Explored

• Keeping the fallback but logging a warning message: Rejected because automation tools usually depend on strict failures to catch configuration mistakes early.

Reviewer Notes

The changes are isolated entirely to the template resolution logic within init().

[sapphi-red]

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